C (XXIX) C listbox CheckedListBox Imagelist

listBox attribute ：

Items： All options

SelectionMode： Whether to support multiple selection

（1）：one You can only choose one

（2）：Multisimple Multiple choices available

（3）：MultExtended Press the key combination to select more

（4）：none There is no choice

Multicolnum：

true： Support horizontal arrangement

false： Horizontal arrangement is not supported

SelectedIndex

listbox The index of the option is from 0 At the beginning of the alignment .

Checklistbox

Items： All options

CheckOnClick

False： You need to double-click to select the option

True： Click to select the option

Imagelist Components

Images：

Set of pictures in the component Use an array to represent

The test uses all the code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
namespace _0416Day
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void putButton_Click(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;
            if(index == 0)
            {
                result.Text = listBox1.SelectedItem.ToString();
            }
            else if(index == 1)
            {
                result.Text = listBox1.SelectedItem.ToString();
            }
            else if (index == 2)
            {
                result.Text = listBox1.SelectedItem.ToString();
            }
            else
            {
                MessageBox.Show(" Please choose the option ");
            }
        }
        /**
         *  Add a button 
         */
        private void Add_Click(object sender, EventArgs e)
        {
            listBox1.Items.Add(Input.Text);
            Input.Clear();
        }
 
        /**
         *  Remove button 
         */
        private void Remove_Click(object sender, EventArgs e)
        {
            int sel = listBox1.SelectedIndex;
            if (sel != -1)
            {
                listBox1.Items.RemoveAt(listBox1.SelectedIndex);
            }
            else
            {
                MessageBox.Show(" Please select the option you want to remove ");
            }
        }
 
        /**
         *  Clear button 
         */
        private void Clear_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();
        }
 
        /**
         *  Check box default event 
         *  Check the text to execute （ Don't modify CheckOnClick You need to double-click to check the attribute ）
         */
        private void fubox_SelectedIndexChanged(object sender, EventArgs e)
        {
 
        }
 
        /**
         *  Check box default event 
         *  Select the text （ Don't tick ） Will execute 
         */
        private void fubox_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            // e It's a parameter object , Equal to the selected value 
            if (e.NewValue == CheckState.Checked)
            {
                //  Selected primary key （ Select to display the picture ）
                switch (e.Index)
                {
                    case 0: pictureBox1.Image = imageList1.Images[0]; break;
                    case 1: pictureBox2.Image = imageList1.Images[1]; break;
                    case 2: pictureBox3.Image = imageList1.Images[2]; break;
                    case 3: pictureBox4.Image = imageList1.Images[3]; break;
                }
            }
            else
            {
                //  Unselected primary key （ After removing the selection, the picture disappears ）
                switch (e.Index)
                {
                    case 0: pictureBox1.Image = null; break;
                    case 1: pictureBox2.Image = null; break;
                    case 2: pictureBox3.Image = null; break;
                    case 3: pictureBox4.Image = null; break;
                }
            }
        }
 
    }
}

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